Lets see how smart you are mentally 2
Level
1
1+1+2+4+8+16+32+64+128+256= _ __ (please do this problem mentally without using any form of cheating)
554
512
503
501
488
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1 solution
---TIP NOT ANSWER---all the numbers asked in the question are even so the answer HAS to be even. so from 5 choices there are now 3 left. Then your mental brain should come to see which one is the correct one!